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Test if a variable is set in bash when using “set -o nounset”
...(x86_64-redhat-linux-gnu)
$ set -o nounset
If you want a non-interactive script to print an error and exit if a variable is null or not set:
$ [[ "${HOME:?}" ]]
$ [[ "${IAMUNBOUND:?}" ]]
bash: IAMUNBOUND: parameter null or not set
$ IAMNULL=""
$ [[ "${IAMNULL:?}" ]]
bash: IAMNULL: parameter nul...
multiple prints on the same line in Python
I want to run a script, which basically shows an output like this:
17 Answers
17
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Is it correct to use JavaScript Array.sort() method for shuffling?
...rr.join("\n")+"\n\nTime taken: " + ((end - start)/1000) + " seconds.";
};
alert("random sort: " + test([1,2,3,4], 100000, randSort));
alert("shuffle: " + test([1,2,3,4], 100000, shuffle));
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What is the difference between `git merge` and `git merge --no-ff`?
...@github.com:me/mywebsite.git
8a0d9ec..333eff5 master -> master
Script for automating the above
Having used this process 10+ times in a day, I have taken to writing batch scripts to execute the commands, so I made an almost-proper git_update.sh <branch> <"commit message"> scr...
Why are Oracle table/column/index names limited to 30 characters?
...b.andrew.cmu.edu/~shadow/sql/sql1992.txt , but if you read section "17.1 Description of SQL item descriptor areas" it says identifiers like names and schemas must allow at least 128 characters.
– Rick
May 4 '11 at 19:43
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Why {} + {} is NaN only on the client side? Why not in Node.js?
...h use V8.
Here is the basic pipe line of what happens when you eval a JavaScript command with Rhino in the Rhino shell.
The shell runs org.mozilla.javascript.tools.shell.main.
In turn, it calls this new IProxy(IProxy.EVAL_INLINE_SCRIPT); for example, if the code was passed directly with the inlin...
Relative imports in Python 2.7
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Script vs. Module
Here's an explanation. The short version is that there is a big difference between directly running a Python file, and importing that file from somewhere else. Just knowing what directory a file is in doe...
PHP best way to MD5 multi-dimensional array?
...t a trivial difference. You may see the results of the test with this live script here:
http://nathanbrauer.com/playground/serialize-vs-json.php
http://nathanbrauer.com/playground/plain-text/serialize-vs-json.php
Now, one thing to note is array(1,2,3) will produce a different MD5 as array(3,2,1)...
How to use a keypress event in AngularJS?
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$scope.myFunct = function(keyEvent) {
if (keyEvent.which === 13)
alert('I am an alert');
}
...
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...统行业业务实践，或进行一个全新的线上互联网技术产品开发，还不如以媒体为切入口，实现与行业受众、从业者、资源等的有效聚合和连接，走“媒体+行业”的创业路径，借助“互联网+”的风口，实现自我的创业梦想。
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